John geary



J. GEARY. DOOR SPRING CONNECTION FOR ELEGTRIG BURGLAB ALARMS.

(NoMddeL) i No. 398,144. Patented Feb. 19, 1889.

WIZJVESSES,

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JOHN GEARY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SHAlV dz; GEARY,OF SAME PLACE.

DOOR-SPRI NG CON N ECTION FOR ELECTRIC BU RG LAR ALARMS.

SPECIFICATION forming part of Letters Patent No. 398,144, dated February19, 1889.

' Application filed August 22, 1888. Serial No 283,416. (No model.)

To a ZZ whom it may concern:

Be it known that 1, JOHN GEARY, a citizen of the United States, residingat Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inDoor-Spring Connections for Electric Burglar-Alarms; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the artto which itappertains to make and use the same.

My invention has relation to door-springs or connections forburglar-alarms, and has for its object the provision of a door-spring ofcomparatively simple and inexpensive construction, and in which thecontacting surfaces which make and break the electric circuit as thedoor is opened and closed shall slide on one another, so as to keep themclean and maintain good contact.

My invention consists in the novel construction, combination, andarrangements of parts, hereinafter described and specifically claimed.

111 the accompanying drawings, Figure 1 is a vertical sectional view ofa portion of a door and a door-j amb with my improved connection inposition in the jamb, the door being closed; Fig. 2, a similar viewshowing the door open, the connection being shown in side elevation inboth views,and Fig. a perspective view of the connection, and Fig. 4aperspective view of a modification.

A designates the face-plate of the connection, which is let into thejamb so as to be flush with the surface of the same, and is held inposition by screws.

a a B B designate arms which project laterally from each edge of theplate A at or about the middle, and support a plate, C, which latter isformed with notches or holes that receive similarly-shaped 111 h b onthe ends of arms B B.

D designates a block of insulating material, which is secured betweenthe ends of arms B B and the plate 0, and E a spring contact-piece,which is attached to the block D, turned in between the arms B B, andhas its end e bent parallel to the plate A.

F designates a sliding plug which passes through holes in the platesA C,and carries a metallic contactpiece, G, which makes contact with thespring contact-piece E when the door is open, and serves as a stop tolimit the outward movement of the plug F.

H designates a spiral spring that surrounds the plug F between the plate0 and the contact piece G, and serves to project the plugoutwardly asthe door is opened.

The operation of the above-described device is accomplished by theopening and closing of the door in the following manner: \Vhen the dooris closed, the parts are in the position shown in Fig. 1, and the plug Fhaving been forced in against the pressure of spring H, thecontact-piece G is held out of contact with spring contact-piece E. Uponopening the door the plug F is forced outwardly by the spring H, and thecontactpiece G is brought into contact with the spring contact-piece E,and the latter, being rigidly secured at one end to the insulatingblockD, slides upon the contact-piece G as the plug is moving outwardly, thusserving to keep the contacting surfaces bright and clean. Upon closingthe door the plug is forced inwardly and the contact-pieces slide uponone another until such time as they part and the contact is thereuponbroken.

It will be observed that the insulatingblock is secured in positionbetween the ends of arms B B and the plate C, being cut away to permitof the passage of the dovetail lugs Z) Z). The plate 0 and theinsulating-block are secured in position by riveting or upsetting theends of the lugs b b, and by this construction the parts are securedtogether firmly and without the use of screws, thus cheapening the costof manufacture, while the parts are more securely held to gether than ifscrews were employed. The spring contact-piece G, being mainly betweenthe arms B B, is protected. from acci' dental injury when the device isbeing placed in position, and the entire device is neat, compact, andnot liable to get out of order or become inoperative.

Having described my invention, I clai1n--- In a door-spring connectorfor electric burglar-alarms, the combination of movable plug F,contact-piece G, carried thereby, In testimony whereof Ihave aflixed mysigspring Contact piece E, plate 0, through nature in presence of twoitnesses. which the movable plug F Works, and insu- T lating-bloek D,with the supporting-arms B JOHB GEARY' 13, having lugs Z) Z), wherebythe insulating- Witnesses:

block D and plate (I are supported, substan- Jos. B. CONNOLLY,

tially as described. R. KENNEDY.

